Merge branch 'download-dropdown-alignment' into 'master'

Fixed alignment of download dropdown

With the new dropdown CSS - some dropdowns might look a bit odd

## Previously

![Screen_Shot_2016-03-16_at_11.46.04](/uploads/c1a8fc95ed4410de35d7bd5caedf28f5/Screen_Shot_2016-03-16_at_11.46.04.png)

## Now

![Screen_Shot_2016-03-16_at_11.45.26](/uploads/998637fe0872b2e826a8c17d183499dc/Screen_Shot_2016-03-16_at_11.45.26.png)

See merge request !3245

app/assets/stylesheets/framework/dropdowns.scss

@@ -9,6 +9,12 @@
   border-left: $caret-width-base solid transparent;
 }
 
+.btn-group {
+  .caret {
+    margin-left: 0;
+  }
+}
+
 .dropdown {
   position: relative;
 }

app/views/projects/repositories/_download_archive.html.haml

@@ -10,7 +10,7 @@
       %span.caret
       %span.sr-only
         Select Archive Format
-    %ul.col-xs-10.dropdown-menu{ role: 'menu' }
+    %ul.col-xs-10.dropdown-menu.dropdown-menu-align-right{ role: 'menu' }
       %li
         = link_to archive_namespace_project_repository_path(@project.namespace, @project, ref: ref, format: 'zip'), rel: 'nofollow' do
           %i.fa.fa-download